Factor 64r^2-49g^2

Rewrite 64r2 as (8r)2.
Rewrite 49g2 as (7g)2.
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=8r and b=7g.
Multiply 7 by -1.
Factor 64r^2-49g^2

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